Cylinder-head.



F. L. SESSIONS.

' CYLINDER HEAD.

APPLICATION FILED AUG.29,1907.

933,789, Patented Sept. 14, 1909.

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UNITE STATES rum 1 crum- SESSIONS, 0F COLUMBUS, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE JEFFREY MANUFACTURING COMPANY, A CORPORATION OF OHIO.

CYLINDER-HEAD.

ceases).

,Patented Sept. 14,1909.

Application filed August 29, 1907. Serial No. 390,681.

The present invention relates to cylinder heads which are particularly adapted foruse as the front heads of rock drills.

The invention can be best explained in connection with the accompanying drawings of which,

Figure 1 is a side elevation of a rock drill cylinder embodying my invention. Fig. 2 is a rear elevation of the same structure shown in Fig. 1. Fig. 3 is an enlarged sectional view of the front end of the structure shown in Figs. 1 and 2. Fig. 4 is an enlarged central longitudinal section of the front end of a rock drill cylinder with the front head in position, a portion of the drill and piston rod being shown. Fig. 5 is an enlarged cgptral longitudinal section at right angles to i 4. Fig. 6 is an enlarged detailed perspective view of the parts of the front head.

Referring to the drawings. it will be seen that the cylinder A is provided with av tapered seat B adapted to receive the cylinder head. The cylinder head M as a whole, is tapered to fit against the seat B and is provide with ears C, D, G and D by means of which it is secured in position with rela; tion to the cylinder. Bolts E and F, pass; ing through holes in the ears C, D, C and D serve to secure the head in position. These bolts are provided with nuts or heads outside the cylinder head and at their other ends are suitably secured. The bolts E and F may pass through guiding ears G and H upon the cylinder. A. central hole I for the passage of the piston rod J is formed in the head and a groove K for containing packlng extends circuniferentially about the hole I. In order that the head can be easily taken out, repaclred and replaced, it is split into two parts as shown, the plane of's'eparation of the parts being preferably diametric and passing centrally through the holes in the ears C, l), C" and D. The abutting faces of the parts of the cylinder head are preferably made smooth as by scraping so that a close joint will be obtained. In order that the parts of the head may be held-in proper relation a dowel pin L may be secured in one of-the partswhile the other part contains a recess for the reception of the dowel pin.

The piston rod drill .reciprocates in the head tion of pressure upon a piston which, it will be understood, is, in practice secured to'the end of the piston rod opposite the drill and runs in the cylinder A. This piston has not which is secured to the under the acbeen shown as its relations to the cylinder and piston rod are apparent.

It will of course be understood that suit- 7 able provision is made for supplying motive fluid to the cylinder but no means for this purpose is illustrated as many such means are well understood-and the means which is employed for this purpose is not material to the present invention. Sufficient of a fluid pressure drill has been shown to illustrate the present invention.

While the invention has been illustrated in connection with a concrete embodiment it will be understood that other structures than the one shown may embody the invention and therefore the invention is not limited to the structure shown.

What I claim is:

1. The combination with a cylinder having a tapered seat at one end, of a tapered cylinder head split along longitudinal lines and on aging said seat and means for securing sai cylinder head to said cylinder whereby the tapered seat serves to hold the two parts of the head together from end to end.

2. The combination with a cylinder haying a tapered seat at its end, of a piston rod, a tapered cylinder head split along longitudinal' lines and fitting said seat and having -nally with respect to the cylinder and to hold the two parts of the head solidly together.

4. The combination with a cylinder having a. tapered seat at its end, of a piston rod,

a cylinder head tapered to fit said seat and having holes through which securing bolts pass, said cylinder head being split through the plane of the axis of said holes for the securing'bolts and having a central hole for ghe passage of said piston rod, and securing olts.

5. The combination witha cylinder having a tapered seat at its end, of a piston rod, a cylinder, head split along longitudinal lines and tapered to fit said seat, said head having a hole for'the passage of said piston rod and a packing groove about said hole,

means for securing said head to said cylinder whereby the two parts of the head are held .in proper relation to each other;

tral hole for the passage of said piston rod,

a packing groove, being, tapered to fit said seat and split through the plane of the bolt holes for -the secur1ng bolts, and securing bolts adapted to hold the head longitudinally in position with respect to the cylinder and to hold the two parts of the head in position relativelyto each other.

8. The combination of a cylinder head split centrally and longitudinally into two halves of constant inside diameter and an outside diameter varying from a maximum to a minimum, with a surrounding yoke, and means for holding said yoke as near as possible toward the part of the cylinder head of maximum diameter.

In testimony in presence of two witnesses.

, FRANK L2 SESSIONS.

Witnesses:

C. E. WAXBOM,

E. P. 'SNIVELY.

whereof I afiix my signature, 

